CN114843427B - Display panel manufacturing method, display panel and display device - Google Patents
Display panel manufacturing method, display panel and display device Download PDFInfo
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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Abstract
本申请实施例公开了一种显示面板的制备方法、显示面板及显示装置，该方法包括：提供一阳极层；通过一次构图工艺在阳极层上形成像素定义层，其中，像素定义层包括第一像素定义层和第二像素定义层，第一像素定义层和第二像素定义层均具有疏水性；对第一像素定义层进行激光处理，以使第一像素定义层由疏水性转变为亲水性。本申请中通过激光处理将第一像素定义层由疏水性转变为亲水性，且像素定义层通过一次构图工艺制备形成，无需通过两次构图工艺分别制备第一像素定义层和第二像素定义层来达到亲水性和疏水性的需求，减少制程工艺，提高了产品良率，并降低了成本。
The embodiment of the present application discloses a method for preparing a display panel, a display panel and a display device, the method comprising: providing an anode layer; forming a pixel definition layer on the anode layer by a single patterning process, wherein the pixel definition layer comprises a first pixel definition layer and a second pixel definition layer, and the first pixel definition layer and the second pixel definition layer are both hydrophobic; laser processing is performed on the first pixel definition layer to change the first pixel definition layer from hydrophobic to hydrophilic. In the present application, the first pixel definition layer is changed from hydrophobic to hydrophilic by laser processing, and the pixel definition layer is prepared and formed by a single patterning process, and there is no need to prepare the first pixel definition layer and the second pixel definition layer separately by two patterning processes to meet the requirements of hydrophilicity and hydrophobicity, thereby reducing the process technology, improving the product yield, and reducing the cost.
Description
Technical Field
The application belongs to the technical field of display, and particularly relates to a preparation method of a display panel, the display panel and a display device.
Background
An Organic LIGHT EMITTING Diode (OLED) has the characteristics of self-luminescence, bending property, wide visual angle, long service life, energy conservation, environmental protection and the like. The existing technology for preparing the OLED display panel mainly comprises an evaporation technology and an ink-jet printing technology, the cost of the OLED prepared by the evaporation technology is high, and the cost of the OLED prepared by the ink-jet printing technology is low and the OLED is easy to be large-sized, so that the ink-jet printing technology is widely focused in the industry.
The key point of the OLED display panel manufactured by the inkjet printing technology is that the organic light emitting material ink is accurately dripped into the pixel pit formed by the pixel defining layer 1 having hydrophobicity, so as to obtain a thin film with uniform film layer, and in order to avoid short circuit caused by direct contact between the anode layer and the cathode layer, the pixel defining layer 2 having hydrophilicity needs to be arranged between the anode layer and the cathode layer, and different manufacturing processes are required because the pixel defining layer 1 and the pixel defining layer 2 are made of different materials, thereby increasing the manufacturing procedure and increasing the cost.
Disclosure of Invention
The embodiment of the application provides a preparation method of a display panel, the display panel and a display device, which reduce the manufacturing process, improve the product yield and reduce the cost.
In a first aspect, an embodiment of the present application provides a method for manufacturing a display panel, including:
providing an anode layer;
Forming a pixel definition layer on the anode layer through a one-time patterning process, wherein the pixel definition layer comprises a first pixel definition layer and a second pixel definition layer, and the first pixel definition layer and the second pixel definition layer are hydrophobic;
The first pixel defining layer is subjected to laser treatment to change the first pixel defining layer from the hydrophobic property to the hydrophilic property.
Optionally, in some embodiments, the first pixel defining layer includes a plurality of row regions arranged along the first direction, each row region includes a plurality of sub-pixel defining layers, two adjacent sub-pixel defining layers are disposed at intervals and cover the anode layer, and the second pixel defining layer is disposed on the anode layer.
Optionally, in some embodiments, the laser processing the first pixel defining layer to change the first pixel defining layer from the hydrophobic to hydrophilic includes:
providing a plurality of laser heads, wherein each laser head corresponds to one row area;
aligning the plurality of row areas with the plurality of laser heads respectively;
Controlling a plurality of laser heads to emit laser;
And moving the plurality of row regions along a second direction, wherein the laser irradiates the plurality of sub-pixel definition layers in the plurality of row regions respectively, so that the plurality of sub-pixel definition layers are changed from the hydrophobicity to the hydrophilicity, and the first direction and the second direction are mutually perpendicular.
Optionally, in some embodiments, the method further comprises:
If the number of the laser heads is equal to the number of the row areas;
then the first pixel defining layer is changed from the hydrophobic to the hydrophilic by one laser treatment;
If the number of the laser heads is smaller than the number of the row areas;
And after the laser processing is finished once, moving the plurality of row areas along the first direction, aligning the plurality of row areas which are not subjected to the laser processing with the plurality of laser heads, and finishing the laser processing for the second time until all the row areas are subjected to the laser processing, so as to finish the conversion of the first pixel definition layer from the hydrophobicity to the hydrophilicity.
Optionally, in some embodiments, after said controlling a plurality of said laser heads to emit laser light, said method further comprises:
And moving the plurality of row regions along a second direction, and respectively irradiating the laser to the plurality of sub-pixel definition layers in the plurality of row regions and anode layer regions corresponding to the plurality of sub-pixel definition layers so as to change the hydrophobicity of the plurality of sub-pixel definition layers into the hydrophilicity, and cleaning organic matters in the anode layer regions.
In a second aspect, an embodiment of the present application further provides a display panel, including:
An anode layer;
The pixel definition layer comprises a first pixel definition layer and a second pixel definition layer, wherein the first pixel definition layer is covered in the anode layer, the second pixel definition layer is arranged on the anode layer, the first pixel definition layer and the second pixel definition layer are prepared and formed through one-time composition process, the first pixel definition layer has hydrophilicity, and the second pixel definition layer has hydrophobicity.
Optionally, in some embodiments, the pixel defining layer includes a plurality of row regions arranged along the first direction, each of the row regions includes a plurality of sub-pixel defining layers, and two adjacent sub-pixel defining layers are spaced apart and cover the anode layer.
Optionally, in some embodiments, the display panel further includes a substrate, a thin film transistor, a flat layer, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and a cathode layer that are sequentially stacked, wherein the anode layer is disposed between the flat layer and the hole injection layer.
In a third aspect, an embodiment of the present application further provides a method for manufacturing a display panel, including:
Providing a substrate;
Forming a thin film transistor on the substrate, and forming a planarization layer on the thin film transistor;
Forming an anode layer on the flat layer through a patterning process;
Forming a pixel definition layer on the anode layer through a one-time patterning process, wherein the pixel definition layer comprises a first pixel definition layer and a second pixel definition layer, and the first pixel definition layer and the second pixel definition layer are hydrophobic;
Laser-treating the first pixel defining layer to convert the first pixel defining layer from the hydrophobic to hydrophilic;
Sequentially forming a hole injection layer, a hole transport layer and a light emitting layer on the anode layer by an ink-jet printing mode;
Forming an electron transport layer and an electron injection layer on the light-emitting layer by an evaporation mode;
a cathode layer is formed on the electron injection layer through a patterning process.
Optionally, in some embodiments, the first pixel defining layer includes a plurality of row regions arranged along a first direction, each row region includes a plurality of sub-pixel defining layers, two adjacent sub-pixel defining layers are spaced apart and cover the anode layer, the second pixel defining layer is disposed on the anode layer, and the laser processing is performed on the first pixel defining layer to change the first pixel defining layer from the hydrophobicity to the hydrophilicity, including:
providing a plurality of laser heads, wherein each laser head corresponds to one row area;
aligning the plurality of row areas with the plurality of laser heads respectively;
Controlling a plurality of laser heads to emit laser;
And moving the plurality of row regions along a second direction, wherein the laser irradiates the plurality of sub-pixel definition layers in the plurality of row regions respectively, so that the plurality of sub-pixel definition layers are changed from the hydrophobicity to the hydrophilicity, and the first direction and the second direction are mutually perpendicular.
In a fourth aspect, an embodiment of the present application further provides a display device, including a display panel as set forth in any one of the above.
The preparation method of the display panel provided by the embodiment of the application comprises the steps of providing an anode layer; forming a pixel defining layer on the anode layer through a one-time patterning process, wherein the pixel defining layer comprises a first pixel defining layer and a second pixel defining layer, and the first pixel defining layer and the second pixel defining layer are hydrophobic; the first pixel defining layer is subjected to laser treatment to change the first pixel defining layer from hydrophobic to hydrophilic. The first pixel definition layer is converted from hydrophobicity to hydrophilicity through laser treatment, and the pixel definition layer is prepared and formed through a one-time composition process, so that the requirements of hydrophilicity and hydrophobicity are met without respectively preparing the first pixel definition layer and the second pixel definition layer through a two-time composition process, the process is reduced, the product yield is improved, and the cost is reduced.
Drawings
The technical solution of the present application and its advantageous effects will be made apparent by the following detailed description of the specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a first process for manufacturing a display panel according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a first structure of a display panel according to an embodiment of the application.
Fig. 3 is a schematic diagram of a second structure of a display panel according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a display panel and a laser head according to an embodiment of the present application.
Fig. 5 is a schematic diagram of a third structure of a display panel according to an embodiment of the application.
Fig. 6 is a schematic diagram of a second flow chart of a method for manufacturing a display panel according to an embodiment of the application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
It should be noted that, compared with the metal mask and the organic light emitting diode display panel manufactured by vacuum evaporation, the inkjet printing technology is paid attention because the metal mask is not needed and the material utilization rate can reach 100%. The pixel arrangement of the organic light emitting diode display panel is generally composed of a plurality of pixel points, each pixel point comprises a red (R) sub-pixel, a green (G) sub-pixel and a blue (B) sub-pixel, and R, G, B sub-pixels are sequentially and circularly arranged to form a matrix. The ink jet printing method is generally adopted, wherein all red sub-pixels are connected, all green sub-pixels are connected, all blue sub-pixels are connected, and linear pixel rows are formed, so that the inks printed in the pixels can be mutually communicated, and finally the volumes of the inks are averaged. Since the organic light emitting material ink is dropped into the pixel pit formed by the pixel defining layer 1 having hydrophobicity to obtain a thin film having a uniform film layer, it is only necessary to provide the pixel defining layer 1 at the periphery of the pixel row.
However, in order to cover the anode layer and avoid short circuit caused by direct contact between the anode layer and the cathode layer, a hydrophilic pixel definition layer 2 needs to be disposed between the anode layer and the cathode layer, and since different materials are used for the pixel definition layer 1 and the pixel definition layer 2, different preparation processes are required, that is, two glue spreading, exposure and development processes are required to complete the preparation of the pixel definition layer 1 and the pixel definition layer 2, thereby increasing the process steps and increasing the cost.
In order to solve the problems in the prior art, the embodiment of the application provides a preparation method of a display panel, the display panel and a display device. Referring to fig. 1 to 3, fig. 1 is a first flow chart of a method for manufacturing a display panel according to an embodiment of the application, fig. 2 is a first structural chart of the display panel according to the embodiment of the application, and fig. 3 is a second structural chart of the display panel according to the embodiment of the application. The display panel 200 may be an organic light emitting diode display panel or an active organic light emitting diode display panel. The specific operation steps of the preparation method of the display panel can be as follows:
101, an anode layer is provided.
In this embodiment, the anode layer 210 of the organic light emitting diode display panel is first prepared, and a patterning process is performed on the anode layer 210 to define a pattern. The anode layers 210 form a multi-row structure, and there are a plurality of gaps disposed at intervals in each row of the anode layers 210.
102, Forming a pixel defining layer on the anode layer through a patterning process.
The pixel defining layer 220 is formed on the anode layer 210 through a one-time patterning process such as glue exposure and development, wherein the pixel defining layer 220 formed through the one-time patterning process includes a first pixel defining layer 221 and a second pixel defining layer 222, i.e., the first pixel defining layer 221 and the second pixel defining layer 222 are formed by the same process. Wherein, if the material of the pixel defining layer 220 is a negative material, the exposure amount of the first pixel defining layer 221 is smaller than the exposure amount of the second pixel defining layer 222; if the material of the pixel defining layer 220 is a positive material, the exposure amount of the first pixel defining layer 221 is greater than the exposure amount of the second pixel defining layer 222.
The first pixel defining layers 221 are formed in the gaps formed by each row of the anode layers 210, i.e., the first pixel defining layers 221 are disposed between each row of the anode layers 210 at intervals, and the first pixel defining layers 221 are located on the same layer as the anode layers 210, i.e., the first pixel defining layers 221 cover the gaps formed by the anode layers 210. Wherein the thickness of the first pixel defining layer 221 is greater than the thickness of the anode layer 210.
Specifically, the first pixel defining layer 221 may include a plurality of row regions arranged along the first direction, each row region including a plurality of sub-pixel defining layers 2211, and two adjacent sub-pixel defining layers 2211 are disposed at intervals and cover the gaps formed in each row of anode layers 210. Wherein the arrangement direction of the plurality of row regions, i.e., the first direction, is the same as the arrangement direction of the multi-row structure of the anode layer 210.
The second pixel defining layer 222 is disposed on the anode layer 210, i.e., the second pixel defining layer 222 is different from the anode layer 210. The second pixel defining layer 222 is located at the periphery of the multi-line structure formed by the anode layer 210 and the periphery of the first pixel defining layer 221.
Since the first pixel defining layer 221 and the second pixel defining layer 222 are manufactured by the same process, the first pixel defining layer 221 and the second pixel defining layer 222 may be made of the same material, and the first pixel defining layer 221 and the second pixel defining layer 222 may be made hydrophobic by coating a material having hydrophobicity on the pixel defining layer 220. The specific process of forming the first pixel defining layer 221 and the second pixel defining layer 222 may be to coat a hydrophobic material on the pixel defining layer 220 by a photoresist coating process, then to expose the pixel defining layer 220 to a semi-transparent mask, and finally to define the first pixel defining layer 221 and the second pixel defining layer 222 by a developing process. Wherein, the thickness of the first pixel defining layer 221 after the developing process is about 0.5 nm, and the thickness of the second pixel defining layer 222 is about 1 nm.
103, Performing laser treatment on the first pixel definition layer to change the first pixel definition layer from hydrophobicity to hydrophilicity.
It should be noted that, the first pixel defining layer 221 and the second pixel defining layer 222 formed by the patterning process have hydrophobicity, and the first pixel defining layer 221 is located at a position where the anode layer 210 and the cathode layer are connected, and the first pixel defining layer 221 has conductivity due to the hydrophobic material, so that the anode layer 210 and the cathode layer are shorted, that is, the first pixel defining layer 221 needs to be provided with a hydrophilic material to block the anode layer 210 from being directly electrically connected to the cathode layer. In the prior art, the first pixel defining layer 221 is made of a hydrophilic material and the second pixel defining layer 222 is made of a hydrophobic material, and the two patterning processes are adopted to form the pixel electrode, so that the process steps are increased, and the cost is too high.
In this embodiment, the first pixel defining layer 221 and the second pixel defining layer 222 are made by the same patterning process, and the first pixel defining layer 221 and the second pixel defining layer 222 have hydrophobicity, so that the hydrophobicity of the first pixel defining layer 221 is only required to be changed into hydrophilicity in order to avoid the short circuit between the anode layer 210 and the cathode layer.
Specifically, the first pixel defining layer 221 is changed from hydrophobicity to hydrophilicity by performing laser processing on the first pixel defining layer 221. To achieve laser processing, a plurality of laser heads 60 are provided, wherein each laser head 60 corresponds to a row region of the first pixel defining layer 221; then, the plurality of line areas are aligned with the plurality of laser heads 60, respectively; controlling the plurality of laser heads 60 to emit laser light; the plurality of line areas are moved in the second direction such that the laser light emitted from the plurality of laser heads 60 is irradiated to the plurality of sub-pixel defining layers 2211 in the plurality of line areas to change the plurality of sub-pixel defining layers 2211 from the hydrophobic to the hydrophilic. Wherein the first direction and the second direction are perpendicular to each other.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a display panel and a laser head according to an embodiment of the application. The plurality of laser heads 60 are arranged along the first direction X, and during the laser processing, the plurality of laser heads 60 remain stationary, and the display panel 200 moves along the second direction Y and drives the plurality of sub-pixel defining layers 2211 in the plurality of row regions in the first pixel defining layer 211 to move, and when the sub-pixel defining layers 2211 move to the position right below the laser heads 60, the laser heads 60 emit laser, so that each laser head 60 can perform laser irradiation on the plurality of sub-pixel defining layers 2211 in one row region, so that the plurality of sub-pixel defining layers 2211 complete the transition from hydrophobicity to hydrophilicity.
The moving speed of the display panel 200 may be 10mm/s, the laser power of the laser head 60 may be 12W, the laser wavelength may be 266nm, the pulse energy may be 2mJ, and the pulse width may be 12ns. The moving speed and the laser power of the display panel 200 are proportional to the hydrophilic state of the first pixel defining layer 221, i.e., the faster the moving speed of the display panel 200 and the greater the laser power, the better the hydrophilic of the first pixel defining layer 221; conversely, the slower the moving speed of the display panel 200 and the smaller the laser power, the worse the hydrophilicity of the first pixel defining layer 221.
Note that if the number of laser heads 60 is equal to the number of line areas; however, if only one laser treatment is performed to complete the transition from the hydrophobic to the hydrophilic of the first pixel defining layer 221 in the entire display panel 200, it is necessary to provide one laser head 60 for each row area in the first pixel defining layer 211, which increases the test cost.
To solve this problem, the present embodiment implements laser processing of the entire display panel 200 by moving the display panel 200 by providing only a part of the laser heads 60, i.e., the number of laser heads 60 is smaller than the number of row areas formed by the first pixel definition layer 221.
Specifically, if the number of laser heads 60 is smaller than the number of line areas; then after completing one laser treatment, the plurality of row regions are moved in the first direction, and the plurality of row regions that are not laser treated are aligned with the plurality of laser heads 60, completing the second laser treatment, until all row regions are subjected to the laser treatment, so as to complete the conversion of the first pixel defining layer 221 from the hydrophobic property to the hydrophilic property.
In addition, in the process of manufacturing the display panel 200, the organic matters are precipitated in the anode layer 210 due to the change of the external environment, and the organic matters affect the process yield of the display panel 200, so that the organic matters need to be removed. It should be noted that, since the plurality of sub-pixel defining layers 2211 in the first pixel defining layer 221 are disposed in the gaps formed by the anode layer 210, the anode layer 210 is irradiated with laser simultaneously during the laser irradiation of each sub-pixel defining layer 2211 by the laser treatment, so that the organic matters precipitated in the anode layer 210 are removed.
Specifically, after controlling the plurality of laser heads 60 to emit laser light, the plurality of line regions may be moved in the second direction, and the laser light may be irradiated to the plurality of sub-pixel defining layers 2211 in the plurality of line regions and the anode layer 210 region corresponding to the plurality of sub-pixel defining layers 2211, respectively, so that the plurality of sub-pixel defining layers 2211 change from hydrophobic to hydrophilic, and organic matters in the anode layer 210 region are washed.
As can be seen from the above description, the present embodiment provides an anode layer 210, wherein the pixel defining layer 220 is formed on the anode layer 210 by a patterning process, and the first pixel defining layer 221 is subjected to a laser treatment, so that the first pixel defining layer 221 is changed from hydrophobic to hydrophilic. The first pixel defining layer 221 is converted from hydrophobicity to hydrophilicity by laser treatment, and the pixel defining layer 220 is formed by one patterning process, so that the first pixel defining layer 221 and the second pixel defining layer 222 do not need to be respectively prepared by two patterning processes to meet the requirements of hydrophilicity and hydrophobicity, the manufacturing process is reduced, the product yield is improved, and the cost is reduced.
Correspondingly, the embodiment of the application also provides the display panel 200. Referring to fig. 5, fig. 5 is a schematic diagram of a third structure of a display panel according to an embodiment of the application, and with continued reference to fig. 2 to 4, the display panel 200 may include an anode layer 210 and a pixel defining layer 220. The anode layers 210 form a multi-row structure, and there are a plurality of gaps disposed at intervals in each row of the anode layers 210.
The pixel defining layer 220 is formed on the anode layer 210 through a one-time patterning process such as glue exposure and development, wherein the pixel defining layer 220 formed through the one-time patterning process includes a first pixel defining layer 221 and a second pixel defining layer 222, i.e., the first pixel defining layer 221 and the second pixel defining layer 222 are formed by the same process.
The first pixel defining layers 221 are formed in the gaps formed by each row of the anode layers 210, i.e., the first pixel defining layers 221 are disposed between each row of the anode layers 210 at intervals, and the first pixel defining layers 221 are located on the same layer as the anode layers 210, i.e., the first pixel defining layers 221 cover the gaps formed by the anode layers 210. Wherein the thickness of the first pixel defining layer 221 is greater than the thickness of the anode layer 210.
Specifically, the first pixel defining layer 221 may include a plurality of row regions arranged along the first direction, each row region including a plurality of sub-pixel defining layers 2211, and two adjacent sub-pixel defining layers 2211 are disposed at intervals and cover the gaps formed in each row of anode layers 210. Wherein the arrangement direction of the plurality of row regions, i.e., the first direction, is the same as the arrangement direction of the multi-row structure of the anode layer 210.
The second pixel defining layer 222 is disposed on the anode layer 210, i.e., the second pixel defining layer 222 is different from the anode layer 210. The second pixel defining layer 222 is located at the periphery of the multi-line structure formed by the anode layer 210 and the periphery of the first pixel defining layer 221.
Since the first pixel defining layer 221 and the second pixel defining layer 222 are manufactured by the same process, the first pixel defining layer 221 and the second pixel defining layer 222 may be made of the same material, and the first pixel defining layer 221 and the second pixel defining layer 222 may be made hydrophobic by coating a material having hydrophobicity on the pixel defining layer 220. The specific process of forming the first pixel defining layer 221 and the second pixel defining layer 222 may be to coat a hydrophobic material on the pixel defining layer 220 by a photoresist coating process, then to expose the pixel defining layer 220 to a semi-transparent mask, and finally to define the first pixel defining layer 221 and the second pixel defining layer 222 by a developing process. Wherein, the thickness of the first pixel defining layer 221 after the developing process is about 0.5 nm, and the thickness of the second pixel defining layer 222 is about 1 nm.
The first pixel defining layer 221 and the second pixel defining layer 222 are made by the same patterning process, and the first pixel defining layer 221 and the second pixel defining layer 222 have hydrophobicity, so that the aim of avoiding the short circuit between the anode layer 210 and the cathode layer is achieved by only converting the hydrophobicity of the first pixel defining layer 221 into hydrophilicity.
Specifically, the first pixel defining layer 221 is changed from hydrophobicity to hydrophilicity by performing laser processing on the first pixel defining layer 221. To achieve laser processing, a plurality of laser heads 60 are provided, wherein each laser head 60 corresponds to a row region of the first pixel defining layer 221; then, the plurality of line areas are aligned with the plurality of laser heads 60, respectively; controlling the plurality of laser heads 60 to emit laser light; the plurality of line areas are moved in the second direction such that the laser light emitted from the plurality of laser heads 60 is irradiated to the plurality of sub-pixel defining layers 2211 in the plurality of line areas to change the plurality of sub-pixel defining layers 2211 from the hydrophobic to the hydrophilic. Wherein the first direction and the second direction are perpendicular to each other.
In addition, in the process of manufacturing the display panel 200, the organic matters are precipitated in the anode layer 210 due to the change of the external environment, and the organic matters affect the process yield of the display panel 200, so that the organic matters need to be removed. It should be noted that, since the plurality of sub-pixel defining layers 2211 in the first pixel defining layer 221 are disposed in the gaps formed by the anode layer 210, the anode layer 210 is irradiated with laser simultaneously during the laser irradiation of each sub-pixel defining layer 2211 by the laser treatment, so that the organic matters precipitated in the anode layer 210 are removed.
Specifically, after controlling the plurality of laser heads 60 to emit laser light, the plurality of line regions may be moved in the second direction, and the laser light may be irradiated to the plurality of sub-pixel defining layers 2211 in the plurality of line regions and the anode layer 210 region corresponding to the plurality of sub-pixel defining layers 2211, respectively, so that the plurality of sub-pixel defining layers 2211 change from hydrophobic to hydrophilic, and organic matters in the anode layer 210 region are washed.
The display panel 200 may further include a substrate 231, a thin film transistor 232, a flat layer 233, a hole injection layer 234, a hole transport layer 235, a light emitting layer 236, an electron transport layer 237, an electron injection layer 238, and a cathode layer 239, which are stacked in this order. Wherein the anode layer 210 is disposed between the flat layer 233 and the hole injection layer 234, the hole transport layer 235, the light emitting layer 236, the electron transport layer 237, the electron injection layer 238, and the cathode layer 239 are all covered in the pixel defining layer 220.
In addition, the embodiment of the application also provides a preparation method of the display panel. Referring to fig. 5 and fig. 6, fig. 6 is a schematic flow chart of a second method for manufacturing a display panel according to an embodiment of the application. The display panel 200 may be an organic light emitting diode display panel or an active organic light emitting diode display panel. The specific operation steps of the preparation method of the display panel can be as follows:
301, a substrate is provided.
The substrate 231 provided in this embodiment may be a glass substrate, which serves as a substrate.
302, A thin film transistor is formed over a substrate, and a planarization layer is formed over the thin film transistor.
A thin film transistor 232 is formed on the substrate 231, and the thin film transistor 232 may be a low temperature polysilicon thin film transistor, an oxide thin film transistor, or the like. A planarization layer 233 is formed on the thin film transistor 232.
303, Forming an anode layer on the planar layer by a patterning process.
The anode layer 210 is formed on the flat layer 233 through a patterning process and a pattern is defined such that the anode layer 210 forms a multi-line structure with a plurality of gaps disposed at intervals in each line of the anode layer 210.
304, Forming a pixel defining layer on the anode layer through a one-time patterning process.
The pixel defining layer 220 is formed on the anode layer 210 through a one-time patterning process such as glue exposure and development, wherein the pixel defining layer 220 formed through the one-time patterning process includes a first pixel defining layer 221 and a second pixel defining layer 222, i.e., the first pixel defining layer 221 and the second pixel defining layer 222 are formed by the same process. Wherein, if the material of the pixel defining layer 220 is a negative material, the exposure amount of the first pixel defining layer 221 is smaller than the exposure amount of the second pixel defining layer 222; if the material of the pixel defining layer 220 is a positive material, the exposure amount of the first pixel defining layer 221 is greater than the exposure amount of the second pixel defining layer 222.
The first pixel defining layers 221 are formed in the gaps formed by each row of the anode layers 210, i.e., the first pixel defining layers 221 are disposed between each row of the anode layers 210 at intervals, and the first pixel defining layers 221 are located on the same layer as the anode layers 210, i.e., the first pixel defining layers 221 cover the gaps formed by the anode layers 210. Wherein the thickness of the first pixel defining layer 221 is greater than the thickness of the anode layer 210.
Specifically, the first pixel defining layer 221 may include a plurality of row regions arranged along the first direction, each row region including a plurality of sub-pixel defining layers 2211, and two adjacent sub-pixel defining layers 2211 are disposed at intervals and cover the gaps formed in each row of anode layers 210. Wherein the arrangement direction of the plurality of row regions, i.e., the first direction, is the same as the arrangement direction of the multi-row structure of the anode layer 210.
The second pixel defining layer 222 is disposed on the anode layer 210, i.e., the second pixel defining layer 222 is different from the anode layer 210. The second pixel defining layer 222 is located at the periphery of the multi-line structure formed by the anode layer 210 and the periphery of the first pixel defining layer 221.
Since the first pixel defining layer 221 and the second pixel defining layer 222 are manufactured by the same process, the first pixel defining layer 221 and the second pixel defining layer 222 may be made of the same material, and the first pixel defining layer 221 and the second pixel defining layer 222 may be made hydrophobic by coating a material having hydrophobicity on the pixel defining layer 220. The specific process of forming the first pixel defining layer 221 and the second pixel defining layer 222 may be to coat a hydrophobic material on the pixel defining layer 220 by a photoresist coating process, then to expose the pixel defining layer 220 to a semi-transparent mask, and finally to define the first pixel defining layer 221 and the second pixel defining layer 222 by a developing process. Wherein, the thickness of the first pixel defining layer 221 after the developing process is about 0.5 nm, and the thickness of the second pixel defining layer 222 is about 1 nm.
305, Performing laser treatment on the first pixel definition layer to change the first pixel definition layer from hydrophobicity to hydrophilicity.
It should be noted that, the first pixel defining layer 221 and the second pixel defining layer 222 formed by the patterning process have hydrophobicity, and the first pixel defining layer 221 is located at a position where the anode layer 210 and the cathode layer are connected, and the first pixel defining layer 221 has conductivity due to the hydrophobic material, so that the anode layer 210 and the cathode layer are shorted, that is, the first pixel defining layer 221 needs to be provided with a hydrophilic material to block the anode layer 210 from being directly electrically connected to the cathode layer. In the prior art, the first pixel defining layer 221 is made of a hydrophilic material and the second pixel defining layer 222 is made of a hydrophobic material, and the two patterning processes are adopted to form the pixel electrode, so that the process steps are increased, and the cost is too high.
In this embodiment, the first pixel defining layer 221 and the second pixel defining layer 222 are made by the same patterning process, and the first pixel defining layer 221 and the second pixel defining layer 222 have hydrophobicity, so that the hydrophobicity of the first pixel defining layer 221 is only required to be changed into hydrophilicity in order to avoid the short circuit between the anode layer 210 and the cathode layer.
Specifically, the first pixel defining layer 221 is changed from hydrophobicity to hydrophilicity by performing laser processing on the first pixel defining layer 221. To achieve laser processing, a plurality of laser heads 60 are provided, wherein each laser head 60 corresponds to a row region of the first pixel defining layer 221; then, the plurality of line areas are aligned with the plurality of laser heads 60, respectively; controlling the plurality of laser heads 60 to emit laser light; the plurality of line areas are moved in the second direction such that the laser light emitted from the plurality of laser heads 60 is irradiated to the plurality of sub-pixel defining layers 2211 in the plurality of line areas to change the plurality of sub-pixel defining layers 2211 from the hydrophobic to the hydrophilic. Wherein the first direction and the second direction are perpendicular to each other.
With continued reference to fig. 4, the plurality of laser heads 60 are arranged along the first direction X, and during the laser processing, the plurality of laser heads 60 remain stationary, and the display panel 200 moves along the second direction Y and drives the plurality of sub-pixel defining layers 2211 in the plurality of row regions in the first pixel defining layer 211 to move, and when the sub-pixel defining layers 2211 move to the position right below the laser heads 60, the laser heads 60 emit laser, so that each laser head 60 can perform laser irradiation on the plurality of sub-pixel defining layers 2211 in one row region, so that the plurality of sub-pixel defining layers 2211 can complete the transition from hydrophobicity to hydrophilicity.
The moving speed of the display panel 200 may be 10mm/s, the laser power of the laser head 60 may be 12W, the laser wavelength may be 266nm, the pulse energy may be 2mJ, and the pulse width may be 12ns. The moving speed and the laser power of the display panel 200 are proportional to the hydrophilic state of the first pixel defining layer 221, i.e., the faster the moving speed of the display panel 200 and the greater the laser power, the better the hydrophilic of the first pixel defining layer 221; conversely, the slower the moving speed of the display panel 200 and the smaller the laser power, the worse the hydrophilicity of the first pixel defining layer 221.
Note that if the number of laser heads 60 is equal to the number of line areas; however, if only one laser treatment is performed to complete the transition from the hydrophobic to the hydrophilic of the first pixel defining layer 221 in the entire display panel 200, it is necessary to provide one laser head 60 for each row area of the first pixel defining layer 221, which increases the test cost.
To solve this problem, the present embodiment implements laser processing of the entire display panel 200 by moving the display panel 200 by providing only a part of the laser heads 60, i.e., the number of laser heads 60 is smaller than the number of row areas formed by the first pixel definition layer 221.
Specifically, if the number of laser heads 60 is smaller than the number of line areas; then after completing one laser treatment, the plurality of row regions are moved in the first direction, and the plurality of row regions that are not laser treated are aligned with the plurality of laser heads 60, completing the second laser treatment, until all row regions are subjected to the laser treatment, so as to complete the conversion of the first pixel defining layer 221 from the hydrophobic property to the hydrophilic property.
In addition, in the process of manufacturing the display panel 200, the organic matters are precipitated in the anode layer 210 due to the change of the external environment, and the organic matters affect the process yield of the display panel 200, so that the organic matters need to be removed. It should be noted that, since the plurality of sub-pixel defining layers 2211 in the first pixel defining layer 221 are disposed in the gaps formed by the anode layer 210, the anode layer 210 is irradiated with laser simultaneously during the laser irradiation of each sub-pixel defining layer 2211 by the laser treatment, so that the organic matters precipitated in the anode layer 210 are removed.
Specifically, after controlling the plurality of laser heads 60 to emit laser light, the plurality of line regions may be moved in the second direction, and the laser light may be irradiated to the plurality of sub-pixel defining layers 2211 in the plurality of line regions and the anode layer 210 region corresponding to the plurality of sub-pixel defining layers 2211, respectively, so that the plurality of sub-pixel defining layers 2211 change from hydrophobic to hydrophilic, and organic matters in the anode layer 210 region are washed.
306, A hole injection layer, a hole transport layer, and a light emitting layer are sequentially formed on the anode layer by inkjet printing.
The anode layer 210 is formed by inkjet printing, vacuum drying, and heat baking, and a hole injection layer 234, a hole transport layer 235, and a light emitting layer 236 are sequentially formed thereon.
307, An electron transport layer 237 and an electron injection layer 238 are formed on the light-emitting layer by vapor deposition.
A cathode layer 239 is formed on the electron injection layer through a patterning process 308.
As can be seen from the foregoing, the present embodiment provides a substrate, a thin film transistor is formed on the substrate, a flat layer is formed on the thin film transistor, an anode layer is formed on the flat layer through a patterning process, a pixel defining layer is formed on the anode layer through a one-time patterning process, a laser treatment is performed on the first pixel defining layer, so that the first pixel defining layer is changed from hydrophobicity to hydrophilicity, a hole injecting layer, a hole transporting layer and a light emitting layer are sequentially formed on the anode layer through an inkjet printing manner, an electron transporting layer and an electron injecting layer are formed on the light emitting layer through an evaporation manner, and a cathode layer is formed on the electron injecting layer through a patterning process. The first pixel defining layer 221 is converted from hydrophobicity to hydrophilicity by laser treatment, and the pixel defining layer 220 is formed by one patterning process, so that the first pixel defining layer 221 and the second pixel defining layer 222 do not need to be respectively prepared by two patterning processes to meet the requirements of hydrophilicity and hydrophobicity, the manufacturing process is reduced, the product yield is improved, and the cost is reduced.
The embodiment of the application also provides a display device, which may include the display panel 200 provided in the above embodiment. The display device may be a full-screen display device, for example, the display device may be a wearable device such as a watch, a bracelet, or the display device may be an electronic device such as a mobile phone or a tablet computer, or the display device may be a product or a component with a display function such as a television, a display, a notebook computer, a digital photo frame, or a navigator.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above description is provided for the detailed description of the preparation method of the display panel, the display panel and the display device provided by the embodiment of the application, and specific examples are applied to the description of the principle and the implementation of the application, and the description of the above examples is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present application, the present description should not be construed as limiting the present application in summary.
Claims (6)
1. A method for manufacturing a display panel, comprising:
providing an anode layer; the anode layers form a multi-row structure, and each row of anode layers is provided with a plurality of gaps which are arranged at intervals;
Forming a pixel definition layer on the anode layer through a one-time patterning process, wherein the pixel definition layer comprises a first pixel definition layer and a second pixel definition layer, and the first pixel definition layer and the second pixel definition layer are hydrophobic;
Laser-treating the first pixel defining layer to convert the first pixel defining layer from the hydrophobic to hydrophilic;
the first pixel definition layer comprises a plurality of row areas which are arranged along a first direction, each row area comprises a plurality of sub-pixel definition layers, two adjacent sub-pixel definition layers are arranged at intervals and cover in gaps of the anode layer, the second pixel definition layer is arranged on the anode layer, and the second pixel definition layer is positioned on the periphery of a multi-row structure formed by the anode layer and the periphery of the first pixel definition layer;
The step of laser-treating the first pixel defining layer to change the first pixel defining layer from the hydrophobic to hydrophilic includes: providing a plurality of laser heads, wherein each laser head corresponds to one row area; aligning the plurality of row areas with the plurality of laser heads respectively; controlling a plurality of laser heads to emit laser; and moving the plurality of row regions along a second direction, and respectively irradiating the laser to the plurality of sub-pixel definition layers in the plurality of row regions and anode layer regions corresponding to the plurality of sub-pixel definition layers so as to change the hydrophobicity of the plurality of sub-pixel definition layers into the hydrophilicity, and cleaning organic matters in the anode layer regions, wherein the first direction and the second direction are mutually perpendicular.
2. The method of manufacturing a display panel according to claim 1, further comprising:
If the number of the laser heads is equal to the number of the row areas;
then the first pixel defining layer is changed from the hydrophobic to the hydrophilic by one laser treatment;
If the number of the laser heads is smaller than the number of the row areas;
And after the laser processing is finished once, moving the plurality of row areas along the first direction, aligning the plurality of row areas which are not subjected to the laser processing with the plurality of laser heads, and finishing the laser processing for the second time until all the row areas are subjected to the laser processing, so as to finish the conversion of the first pixel definition layer from the hydrophobicity to the hydrophilicity.
3. A display panel formed by the method of manufacturing a display panel according to any one of claims 1 to 2, the display panel comprising:
An anode layer;
The pixel definition layer comprises a first pixel definition layer and a second pixel definition layer, wherein the first pixel definition layer is covered in a gap of the anode layer, the second pixel definition layer is arranged on the anode layer, the first pixel definition layer and the second pixel definition layer are prepared through one-time composition process, the first pixel definition layer has hydrophilicity, and the second pixel definition layer has hydrophobicity.
4. The display panel according to claim 3, further comprising a substrate, a thin film transistor, a flat layer, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and a cathode layer which are sequentially stacked, wherein the anode layer is disposed between the flat layer and the hole injection layer.
5. A method for manufacturing a display panel, comprising:
Providing a substrate;
Forming a thin film transistor on the substrate, and forming a planarization layer on the thin film transistor;
Forming an anode layer on the flat layer through a patterning process; the anode layers form a multi-row structure, and each row of anode layers is provided with a plurality of gaps which are arranged at intervals;
Forming a pixel definition layer on the anode layer through a one-time patterning process, wherein the pixel definition layer comprises a first pixel definition layer and a second pixel definition layer, and the first pixel definition layer and the second pixel definition layer are hydrophobic;
Laser-treating the first pixel defining layer to convert the first pixel defining layer from the hydrophobic to hydrophilic;
Sequentially forming a hole injection layer, a hole transport layer and a light emitting layer on the anode layer by an ink-jet printing mode;
Forming an electron transport layer and an electron injection layer on the light-emitting layer by an evaporation mode;
Forming a cathode layer on the electron injection layer through a patterning process;
the first pixel definition layer comprises a plurality of row areas which are arranged along a first direction, each row area comprises a plurality of sub-pixel definition layers, two adjacent sub-pixel definition layers are arranged at intervals and cover in gaps of the anode layer, the second pixel definition layer is arranged on the anode layer, and the second pixel definition layer is positioned on the periphery of a multi-row structure formed by the anode layer and the periphery of the first pixel definition layer;
The step of laser-treating the first pixel defining layer to change the first pixel defining layer from the hydrophobic to hydrophilic includes: providing a plurality of laser heads, wherein each laser head corresponds to one row area; aligning the plurality of row areas with the plurality of laser heads respectively; controlling a plurality of laser heads to emit laser; and moving the plurality of row regions along a second direction, and respectively irradiating the laser to the plurality of sub-pixel definition layers in the plurality of row regions and anode layer regions corresponding to the plurality of sub-pixel definition layers so as to change the hydrophobicity of the plurality of sub-pixel definition layers into the hydrophilicity, and cleaning organic matters in the anode layer regions, wherein the first direction and the second direction are mutually perpendicular.
6. A display device comprising the display panel according to any one of claims 3 to 4.
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